lever for a second short stroke to engage the clutch
(5) If further operation is to be performed,
more firmly on boom hoist drum)
grasp trigger-lever and squeeze together while moving
swing lock lever backward, then install swing lock lever
(2) Pull boom hoist pawl control handle out to
wedge in front of lever.
remove pawl from engagement with gear on boom hoist
drum.
e. Steering.
(3) Pull boom hoist clutch lever toward
(1) Engage steering wheel with steering gear
operator and raise boom. As boom approaches proper
by turning steering gear engaging lever (fig. 2-24) to the
position, slow down by moving clutch lever toward
down position.
neutral, and as boom angle indicator (para 2-8) shows
(2) There are four different positions (or
proper angle, move clutch to neutral, which sets brake,
combinations) of the propel clutches and brakes
stopping the boom.
possible by turning steering wheel as follows:
(4) To lock and maintain booms stationary
(a) Position number one. Turn steering
position, push boom hoist pawl control handle down and
wheel counterclockwise as far as it will go. This will
engage pawl in teeth of gear on boom hoist drum.
mechanically set both propel brakes and disengage both
(5) In preparation for lowering boom, pull
of the jaw clutches. This position is used when digging,
boom hoist clutch lever back toward operator just
or when machine is parked for a prolonged period.
enough to take drum pressure off pawl; pull boom hoist
(b) Position number two. Starting with
pawl control handle out to disengage pawl, then move
wheel in position number one, turn wheel about one and
hoist clutch lever back to neutral.
one half turns clockwise. This will set the left hand
(6) Lower boom by moving boom hoist clutch
brake and engage the right hand jaw clutch. The crane-
lever away from operator. Boom will fall by gravity.
shovel will turn, to the left when the swing/propel lever is
Operator will control rate of boom descent by moving
pushed away from the operator.
clutch lever back toward neutral. Leave clutch lever in
(c) Position number three. Starting with
neutral when boom is in desired position.
wheel in position number one, turn wheel two turns
Caution
clockwise. This will release both propel brakes, and
When lowering boom to a horizontal
engage both jaw clutches. The craneshovel will travel
position, never lower it below plane
straight ahead when the swing/ propel lever is pushed
of crane-shovel. When the ground
away from operator.
level in front of crane-shovel is lower
(d) Position number four. Turn steering
than crawler tread, build up cribbing
wheel clockwise as far as it will go. This will set the right
under boom point to keep it
hand brake and engage the left hand jaw clutch. The
horizontal. Booms have collapsed
crane-shovel will turn to the right when the swing/propel
under lifting stress applied at this
lever is pushed away from operator.
critical angle.
Note
d. Traveling. For traveling the crane-shovel more
All travel directions are given with
than 100 feet, revolving frame must be positioned with
the front of the crawler (idler
boom foot over crawler so that idler sprockets lead in
sprocket toward front) under the
forward travel. Swing revolving frame (b above) into
front end of the upper revolving
proper position when necessary, then travel as follows:
machinery.
(1) Remove wedge from in front of swing lock
(3) When
travel
is
completed,
and
lever (fig.
craneshovel is in position for next task, disengage,
together while moving swing lock lever forward. (It may
steering wheel by lifting engaging lever (fig. 2-24) up.
require swinging the revolving frame a little left or right
before lock will engage ring gear).
f. Operation of Front End Components. Operation
(2) Move the swing and propel shifter lever
of the various front end components are properly de
scribed in the section devoted to auxiliary materiel used
quadrant.
in conjunction with the crane-shovel as listed below.
(3) To travel forward, push the swing and
Crane operation (para 2-28)
propel clutch lever (fig. 2-23) away from operator. To
Clamshell operation (para 2-29)
travel in reverse, pull lever back towards operator. For
Dragline operation (para 230)
information on how to steer, refer to e below.
Shovel operation (para 2-31)
(4) When travel is completed, move swing
Backhoe operation (para 2-32)
and propel shifter lever (fig. 2-23) back to engage rear
Piledriver operation (para 2-33)
notch on quadrant.
Jib boom operation (para 2-34)
2-30
